81547015561343 has 2 divisors, whose sum is σ = 81547015561344. Its totient is φ = 81547015561342.

The previous prime is 81547015561217. The next prime is 81547015561369. The reversal of 81547015561343 is 34316551074518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81547015561343 - 2⁸ = 81547015561087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81547015569343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40773507780671 + 40773507780672.

It is an arithmetic number, because the mean of its divisors is an integer number (40773507780672).

Almost surely, 2^{81547015561343} is an apocalyptic number.

81547015561343 is a deficient number, since it is larger than the sum of its proper divisors (1).

81547015561343 is an equidigital number, since it uses as much as digits as its factorization.

81547015561343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048000, while the sum is 53.

The spelling of 81547015561343 in words is "eighty-one trillion, five hundred forty-seven billion, fifteen million, five hundred sixty-one thousand, three hundred forty-three".